Co-doping green-emitting CaF2:Ce3+,Tb3+ and yellow-emitting phosphor particles for improving the cct deviation and luminous efficacy of the in-cup phosphor packaging WLEDs

Abstract

In last few decades, Light emitting diodes (LEDs) with a series of excellence advantages is considered as the next generational light source. In this research, by co-doping the Green-emitting CaF2:Ce3+,Tb3+ phosphor to yellow-emitting YAG: Ce phosphor compound of the 7000K and 8500 K in-cup packaging white LED lamps (WLEDs), an innovative solution for improving color uniformity and luminous efficiency is proposed, investigated, and demonstrated. By using Mie Theory with Mat Lab and Light Tool software, the obtained results show that the CCT Deviation and luminous efficacy of the 7000 K and 8500 K in-cup phosphor packaging WLEDs crucial are influenced by the Green-emitting CaF2:Ce3+,Tb3+ phosphor's concentration. The results show that the green-emitting phosphor can beconsider as a potential practical solution for manufacturing the in-cup packaging phosphor WLEDs in the near future.